Front electrode structure of solar battery and manufacturing method of front electrode structure

Abstract

The invention relates to the field of solar batteries, in particular to a front electrode structure of a solar battery and a manufacturing method of the front electrode structure. The manufacturing method comprises the following steps of: bonding, namely pasting silver paste on a metal wire and bonding the metal wire with the silver paste on the surface of a silicon slice so as to form a thin grid wire; drying, namely drying the silicon slice bonded with the metal wire at the temperature of 200 to 400 DEG C; and sintering, namely sintering the dried silicon slice at the temperature of 700 to 900 DEG C, so that high ohm contact is formed between the silver paste and the silicon slice, and the silver paste and the metal wire are sintered into a complete conductor. The structure comprises the silicon slice and the metal wire which are bonded with each other through the silver paste. In the invention, the metal wire is used for replacing the thin grid wire on the original silicon slice, so the thin grid wire is narrowed; therefore, the light shield area of the thin grid wire is reduced greatly and the conversion efficiency of the solar battery is improved.

Description

Technical field [0001] The invention relates to the field of solar cells, in particular to a front electrode structure of a solar cell and a manufacturing method thereof. Background technique [0002] Crystalline silicon solar cells are currently the mainstream solar cells. The production process is in sequence: de-damage layer texturing, diffusion, dephosphorization silicon glass, etching the periphery, PECVD deposition of silicon nitride passivation anti-reflection film, screen printing front and back The electrodes, the front and back electrodes are co-sintered. Among them, screen printing is the main electrode production method at present, but it is difficult for screen printing fine grid lines to be below 100 microns, and mainstream equipment can only achieve 120-150 microns, so the shading area of ​​the front electrode can reach 5-8%. It restricts the further improvement of battery efficiency. [0003] Patent CN100576578C provides a method for producing electrodes for chemi...

AI Technical Summary

Problems solved by technology

Among them, screen printing is currently the main electrode production method, but it is difficult to achieve a fine grid line of less than 100 microns in screen printing, and mainstream equipment can only achieve 120-150 microns, so that the shading area of ​​the front electrode reaches 5-8%. Restricting the further improvement of battery efficiency

[0003] Patent CN100576578C provides an electrode manufacturing method of electroless plating groove buried grid, the width of the thin grid line can be reduced to less than 50 microns, which greatly reduces the shading area of ​​the front electrode, but this method is difficult for industrial processing and the production cost high

[0004] Patent CN101483199A provides a new type of electrode structure, which uses conductive metal wires with a diameter of 0.1-0.17 mm as bus grid lines, cancels the main grid lines, reduces the shading area with a width of about 3 mm, and can improve the conversion efficiency of solar cells , but its production method is to print silver paste on the front of the battery using a conventional screen printing process to make uniformly distributed point electrodes, and then weld the metal wires on the points point by point, but this common process is complicated and time-consuming. increase the cost of industrialization

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